During school, Dennis looked up to his older brother, emulating him in many ways; garnering a love for photography, an almost permanently cheery attitude and showed incredible enthusiasm towards Harry Potter and Dumbledore's Army. After the events that transpired at the end of Dennis' third year; the death of Dumbledore and the takeover of Hogwarts by Death Eaters, Dennis and his brother were pulled out of school and went into hiding. While in hiding, Dennis and his brother tuned in to Potterwatch and listened for updates on the war effort. When Dumbledore's Army was recalled, Dennis returned to Hogwarts along with Colin, despite his family's wish to stay behind. Although initially sent away by Professor McGonagall, Dennis followed Colin when he snuck into the Room of Requirement and fough